2.5" 4s 1106 12a whoop board

By matthew saigon on Sep 10, 2019

7  254  5

this is just an update to 2.5" 4s kind of builds.
these types of setups was popular 1-1.5 yrs ago, like babyhawk R 2.5" . still a great flier.
with a touch of modern stuffs ( whoop board, runcam nano )
whoop boards help keeping the profile very low and better flight characteristic.

i'm not a good pilot to take advantage of this build.
so if you want to know how it can really fly, just watch youtube videos from others.
similar quads are:
babyhawk R 2.5", skystars x120 Bolt, ( Nick Burns' favorite )
Ciotti fpv's 2.5" 4s 1304, Kabab's 2.5" 4s 1108 ( but keep KV low, around 4500kv. i don't know if 4s 5000kv works, you can try and let people know )
so look for those videos from them from last year or so and also from many other good pilots

so if these builds are still your favorite or if you're new and curious
then this build is great.

the reason for modifying the frame is the original top plate is too small and weak. ( or you could just use chopstick cs3 :) )
i'm using two bottom plates of Geprc Phantom frame. chopped arms off one frame and use it as top plate.
i trimmed around camera area to keep top plate as low as possible.
you might need camera mount. i got mine from a different frame ( chopstick cs3 frame )

weight: 83g dry
battery: Gnb 4s 520mah
i'm using skystars 1106 4500kv ( i can't find them anywhere, so no link for them )
Emax 1106 4500kv, should be the same.
Runcam nano 2
eachine nano vtx
12a Geprc whoop board
xm+ receiver

PID is not good, but it's flyable. good starting point.
betaflight 4.0.6
i used betaflight community presets and changed PID a bit. https://github.com/betaflight/betaflight/wiki/Community-Presets
set gyro_lowpass_type = BiQUAD
set dyn_notch_min_hz = 150
set dyn_lpf_gyro_min_hz = 150
set dyn_lpf_gyro_max_hz = 700
set dyn_lpf_dterm_min_hz = 150
set dyn_lpf_dterm_max_hz = 250
set dterm_lowpass_type = BiQUAD
set dterm_lowpass2_hz = 150

set p_pitch = 27
set i_pitch = 85
set d_pitch = 28

set p_roll = 22
set i_roll = 78
set d_roll = 25

set d_min_pitch = 12
set d_min_roll = 10
set d_min_boost_gain = 30
set d_min_advance = 0

set pidsum_limit = 1000

set iterm_relax_type = GYRO
set iterm_relax_cutoff = 10

set tpa_rate = 50
set tpa_breakpoint = 1600

note: the battery ( Gnb 4s 520mah HV ) is a bit small. i think regular 550mah is better.
i'm not used to it. it has more control than my usual builds which are light, fast and floaty.
someone with more experience would appreciate this kind of builds more.



Sign in to comment

MTopp   3 days ago  

Looks snappy

Show 1 more comment
MTopp   2 days ago 

yeahh, that's why I like the larva x so far except the crappy canopy, but I crashed and killed 2 motors and happymodel uses stupid 3 hole proprietary mounting so I ordered a pickle toothpick frame and twig canopy and some geprc motors from tacoRC for it lol. I cant wait for motors to get here for a month or 2 from Banggood.

matthew saigon   2 days ago 

i feel like, if you like larva x then you wouldn't like this build. this one is for someone who don't like the floaty feel.

MTopp   2 days ago 

yeah, I mean idk what exactly I like yet either, but I think I do like it a tad floaty for sure is nice for freestyle

Guides & Reviews

44 4,887  29
25 days ago

Want to learn how to build an FPV rig? This guide will walk you through your first FPV freestyle build. These parts were hand-picked to balance cost and maximize performance. The TBS Source One is a popular frame for it's low cost, high quality carbon fiber. It's easy to work with and provides more than enough space for your electronics. We've got a 32bit 4-in-1 ESC to bring you the smoothest flights..

Read more
40 5,152  30
Jul 30, 2019

You've probably heard the term "Cinewhoop". Traditionally it's a 3" ducted quad capable of carrying a GoPro Hero7 Black at a low 10 degree angle. More recently the term "Cine" has been applied to a number of RTF quads ranging from 85mm to 3". They all focus on their HD capability, but none compare to the stabilization of Hypersmooth (only available on the Hero7 Black). This is what really offers that..

Read more